Spring-chuck.



B. M. W- HANSON.

SPRING GHUUK- APPLIOATIUH rnnn In. B, 1907.

Patented Aug. 23, 1910.

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is a longitudinal vertical section of carried by the chuck-spindle,

UNITED STATES PATENT OFFICE.

BENG-T M. 'W. HANSON, 0F HARTFORD, CONNECTICUT, ASSIGNOR T0 BBATT & WHITNEY COMPANY, OF HABIFORD, CONNEO'IIGUT, A CORPORATION OF NEW JERSEY.

- SEEING-CHUCK.

Specification of Letters Patent.

Application filed March 8, 1907. Serial No. 361,260.

Patented Aug. '23, 1910.

To all whom it may concern:

Beit known that I, BENGT M W. HAN- SON, a citizen of Sweden, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements Spring-Chucks, of which the following is a specification.

This invention relates to chucks of a kind havinga face-plate slotted to producea series of segments or sections and having an inclined periphery cooperating with a reverse incline on theinner wall of a recessed head said face-plate being drawn within the head to effect compression of the segments.

Primarily the object of the invent-ion is the provision in connection with a face-plate having resilient sections or segments of work-clamping-jaws, one for each segment, andineans whereby said aws may be ad-' justed toward and from the axis of the chuck-spindle.

Other objects of the invention are the V provision of improved details of construction, as will be hereinafter explained.

In the accompanying drawings, Figure 1 one form of. the improved chuck Fig. 2 is a front end view. Fig. 3 is a transverse vertical section on line 3, 3 of' Fig. 1., Fig. 4. is a longitudinal vertical'section of another form of the improved chuck. Fig. 5 is an end view of Fig. 4. Fig. 6 is a view partially in section and in elevation of another form of-construction, and Fig.7 is a front view of Fig. 6. Fig. 8 is a section on line 88 of Fig. 1, looking in the direction of the arrow, and Fig. 9 is a partial sectional detail on line 9-9 of Fig. .8. 40

Like numerals designate similar parts throughout the several views.

Referring to the drawings,-the numeral 1 designates a chuck-spindle enlarged and externally-threa'ded at 2 at its forward end to receive a head 3 having an internally-' threaded hub-4, and said head also having a recess 5. with an inclined peripheral wall 6 in its front part. V

Designated by 7 is a face-plate, shown as.

flat and as split at 8 into a series of segments 9', and having an inclined periphery 10 and a hub also split at 12 at right-angles to and in line with the slots 8 of the face-plate.

In other words, the slots of the face-plate spring annulus face-plate are p for the reception of nuts 19, adjustable along- -rotation by a pin 26 entering a a are carried down and into the hub where they terminate adjacent to the rear end thereof, as illustrated in Fig. l. A chamber 14. is formed in the inner side of the faceplate, and in said chamber is placed a split- 16 surrounding a ring 15, said annulus serving normally by its springlike action to expand the resilient segments, .said expansion being limited by ring 15, which together with said annulus is held 1n place by pins 17. The ring 15 sei'ves also i to protect the split faceplate 7 against possible injury while removed from the machine-spindle. In the split front of the formed grooves or slots 18,

the same, said nuts being secured by bolts 20, the heads .of which are received in recesses of chuck-jaws 21.

-Designated by 22 is a pull-rod or jawactuating member having a'n'inclined head 23, which fits within thetubular'hub and bears against the inclined inner wall of the same, the stem of said pull-nod passing through a perforation 25 in the rear end of the hub, and the rod being prevented from recess in its head, as shown in dotted lines Fig. 1.

Designated-by 27 is a-cap having a chamber to receive the inner end of the spindle 1', said cap being slotted at 28, and perforated in its walls at both ends. 29 is fitted in the slot 28, is bifurcated at one end at 29 to receive a drive-pin 30, and is provided with a hook 31 at its opposite extremity through which an eccentric portion 32 of a bolt 32 passes, said bolt being prevented from longitudinal displacement by a screw 33 entering a groove 34. On its ends the bolt is provided with heads 35 suitable for the reception of a Wrench.

turning which the pull-rod will be actuated to force the face-plate within t-herecess of the head 3, and to cause the chuck-jaws thereof to engage an object to be held, after which a final powerful gripping action may be produced thereon by turning the eccentrio-bolt .32. By releasing said nut and eccentric bolt,the spring-like action of the segments 9' together with the expanding tendency of the'split spring annulus v16 will ment with said threaded endis a nut 37, by

8'5 Aperforated block Slipped over: the rear. threaded" end of pull-bolt 22 is a Washer 36, and in engage-- .25 'Inthe causes aid segments to expand and withdraw said chuck-jaws. head 3 enters a hole in the face-plate and prevents-it from independent rotation.

In the'form of the invention illustrated in Figs. 4 and 5 the head3 is replaced by one designated by39, and difiering but colorably from said head 3, and thespmdle 40 is provided with a threaded boss or circular enlargement 41, the space between the end of the boss and the extremity of the spindle being filled by a conicalsleeve 42, the face plate is split'in the same manner as in 1, and the slits 8 end in a hub 43pass1ng through a sleeve 42', externally threaded to receive the internal threads of ,an operating tube 44, and the.

jaws 45 of jaws 21 are replaced by different formation. In other :respects the parts are the same, workin the same way, and are marked with like 'nu-' merals.

:of the face-plate,

i In 'Figs. 6 and? the chuck-jaws 21 are actu- 'ated by screws 46 collared into perforations and enga nuts 47 of the jaws said nuts traveling in the slots 18. detail view Fig. 9 the parts-repre sented are the same as in llig. 1.

From what has been stated-it willbe.

evident that in all forms of the invention shown and-in man& other forms which .couldbe illustrated, e principle of the in- Vention is the eainefthat, therefore, changes I I -may be made without departure from my ments are especially the split face-p ate,

that such invention is not ecific means for drawingin nor to any particular form of -.chuck-ja'ws carried by the sections invention; and limited to any 's i of said face-plate.

Itwill'be obvious from what has. been hereinbefore set :forth that my improve": applicable to what are known as I steppe chucks. A chuck-of ty e is'of articular advantage inhold 1 ingcyindrica' or su SWPtially cylindrical work during the I A stepped chuck is of H50 dmg' of one face andhalf the perip ery thereof after the correspondm' g portions have been previously groun' or otherwise operated u on;

the workto'beheldthereby is always of umformsize. Where with the ordinary chucks of the kind referred to, thesame In this thereafter closed u on said work to clamp be peossiblewhile'if the second piece of work to have to be altered as to size to meet the'particular conditions of, work is not the case with my im roved chuck.-

be assumed that With the ordinary stepped chhck a piecejof work is to be held. thereby. event the jaws are first. opened and the. same. Should it'be necessary to o erate ona smaller pie'ceof work this w not held is still "larger the work-receiving g f'the chuck has to be enlarged to receivethe'same. It therefore requires but A. dowel-pin 38 of the- -my chuck which possesses with the extra advantage of per sa tth face t working portions thereof equals will thenbe relieved tions 9-subsequent to'w 'chthework will prime utility w ere .I claim is:

a short time to render such ordinary chucks useless and they therefore must be carded. In other words there is no positive provision for adjustment and if they are to be enlarged they are practically spoiled or ruined. Practically therefore the customary st'epped chuck will onlyhold one dissize ofwork and'its use to receive .difierent sizes of work is so costly as to be practically silient sections which removably receive j bodily adjustable 'aws.. These jaws can be moved toward or om'the axis of the chuck to meet the difierent conditions, being of course ground alo their operative faces to adapt them to the jaws become useless; they can be cast aside as they 'costonly a few cents." In this connection I deem it demeter of the'work. In time these removable sirable to refer, to the method of using my chuck. The jaws 45 are adjusted either inward or outward as the case may be until their workingportions bound a circle which is smaller in diameter than the size ofwork to be clam ed thereby. A stickof wood or other artic e is then inserted into the central x plate 7 follow which e sections 9are mammal ashefimbefore set forth; this results aws in their adjusteld ositibns, When this a is concluded the wor portions of the jaws can be cut away, reduced o'rf-ground untilthe circle bounded by said 'aws or v meter that of the work. The Ipressure on free' be introduced into said jaws and finallythe in firmly holding. the

the jaws said sec latter'will be closed u on thework by thesecond constriction 0 said resilient sec- Havmg. thus described the invention, what L-A chuck having jaws, an endwise movmember, a spindle through w chsaid r .able pull-rod constltuting a, 'aw-actuatinxglextends, a ca closing the outer end of said V spindle and said a rod,

aving a chamber to receive a rocking member supported by 'saidcap a nut threaded on the outer end of the r and engaging. against said rocking member, and a cam sup drted by the ca for operating .sa1d roc member an thereb the, nut to impart an outward thrust to sai' i! -rod. 2. A c 'uck having jaws, an endwise movable pull-rod constituting a -jaw-'actuatin member, a spindle through which saidr extends, a cs1 closing the outer end of the spindle and sajid cap and through which s'ai aving a chamber. to receive said rod, a ro'cking member supgorted by rod extends, a nut'threaded on the outer end if the rod and bearing against the rocki g member, and a bolt supported by said 0&5

and having a cam portion to swing sai (I rocking member, the latter having a recess .to recelve said cam' portion.

In testimon whereof I affix'my signature in presence 0 two witnesses;

g K w "B. M. W. HANSON. Witnesses:

' KATE. T. M. O QONNnLL, \JOEL W. JOHNSON. 

